Hi ive already done this trick and it worked for me, Mostly it needs patient to Earn this amount Gralat.
Theres only Three Step, But you gotta wait this might take some hours but its Worth it if you need a Head already.
1st Step - Invite some People to Farm @ your house , while your doing the pyrat quest. When your done Pay them Gralats and Get Them. (Gralats Estimated: 2650)
2nd Step - Bush Farm til you get 5000 + them with the 1st Step = 7650
3rd Step - Bush Farm again til you get 2000 Gralats + 2nd step = 8650.
This Step is for the rushers but the step might take about 4 - 8.5 hours a day.
then Repeat, You will get 25950 In 3 Simple Days!

This is not for the lazy people
NOTE: Do this non stop at one day, easier if you have friends